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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd9877c5f4718cbbe6d9d45edd4cb49c2f2e786237444fa4caf3ea0b4a70efe' 
  AND token = 'l5I0kMOiS3Mt8af50wNMLnT4QzP/A2heCK3G6P68H60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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