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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a7262798fbe87dafc9818a597478e2b5b35c971f7c8732daf4828c420a349e' 
  AND token = 'kGDVtCEqguDHzM7WH5GfOo3Bvnm6Lh9sKLbVsFABscM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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