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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db191d170aa450b0ed05e0159e98f467fc7fcbe6cdd92f9d0b27aba3767727d3' 
  AND token = '+eBwHjRuAibk/823Sh1iqJhyY9cMINfzSmK4p3JSXCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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