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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddbe498512e7d5fda778ffa4aaff52578a98f2a7f8b7bcd3f68bbe0282dc6f8' 
  AND token = 'Rqt2W44Vy/eXLyQ2R6iw3+X1ew/XWZwJ9nbDrZVrLck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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