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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ad15b9ec2259f618e46c1c3c4f78074bc1331024deae197d7029a91a700ac5' 
  AND token = 'Uz1zC50lU9QATdJsnWxu+xd3rPE1cN5pHwou3s6oSok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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