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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38e327c1c68c8790935d616d113165dd2d7a8464d6665da7ec5f005a3f8c9a3' 
  AND token = 'NFFKmqeY+ndp6Ev8cH0Rjo9ooXRaNq/HiPHjNcGkOSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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