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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a6c04dc1a4e21cccec374e10f53a87f2d819567ee0cb6972f866684ce9fc1e' 
  AND token = 'DuIs+Bq8MHhvLGKLmPj0isrQj84wvaInuy2n9QaKk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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