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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bbb4a735db2b8e0b33d9b861caf2734c4cebcf6d77610ef20bbbd37c760868' 
  AND token = 'dsLJQH/aukItlG1WdhU94WK7DNUsvF0WZC3NDP4+vdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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