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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1475c6747ce135b16f2662621222673ad276a56e4dd8d7cff4bc200c4adc5628' 
  AND token = 'IlFfDGEgvPqjM0mYFBiu7XJdT9K7yS4k9r3wPbO8sEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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