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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b7b3acb3a5b8207fb995ac4dd0a44842f479189736a005e9f71fa115eb6603' 
  AND token = 'Abq8FVk5SAt9MFA6INu2Bi72r0U/Mj9pYAFX5lLQUu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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