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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d7230621f2275cec9b86b31bbdef1d08251f110f92c6c0a75951da7517a2b9' 
  AND token = 'TjbF5l/yt1HBsQLp8E4WfHbJW6so0AN/4Piek3KaVWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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