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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecd82b5210d5a18953b681908fbd78da306ff5ae9b6b4234a1ae8fcfccf03d9' 
  AND token = 'mlHAHMss9dmbL1pA5VGAr3leYqN5Cx4Ti1x1l89mupQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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