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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a13439fb6043800bb003e9a766d4d8327e37bae09509f96cf33a1df530a9a5' 
  AND token = 'np5IhLVw15Hkaq5vYUQ7vLiCgD2Wd3FXzlwYDOp5Yew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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