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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0330c41d94281d44347de902f55426fd83f395e1add1d3fe7bf1c8c7e9a6437' 
  AND token = 'MimO11rdaE/zYXM305491z4tNJ2urcMvgakyj8QrP7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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