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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4bc771fb3fd4c9cfcfc1a3a05d903a927855cb71d8ce47e1c30c77f4bbd02e' 
  AND token = '0S3p0Gy3eCWE7qlKYXtSp4T3rtzBBtAzxxR4shmpSxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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