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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9800fc03aaddb3b1d174dfd079f8ee9242d136ff8bd4265e069e0532f7c7d3' 
  AND token = 'a9Npf7e1/uaOnbJlGdcT4d8ms1U7cro1lJ4XIEhOWI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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