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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0156115451d2497a5397b8296fca5ee3f26d300bf1bb1fca0a78333882d347ba' 
  AND token = 'fPAXDF0b4up058ta4YkyeyutECC0S78WyyRUmu8ke7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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