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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d8d104e01d72069002a84e9f8510a86d908ed4f1f2fd6a013d33468468afbd' 
  AND token = 'ahXGPdm1B2YV+VJADiahO4HgFrSsYKUu4/PIjiQ0uL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}