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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c467a1d433fbf96b892fa796c70ccd46da832333f2614091e1880573c79baad' 
  AND token = 'NrTCG1u9a4z/KRXsY5jaUTK7K18D6Vxhrvpkakm6Xz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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