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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e758c120d0ed60fb698088ad8f033ca6505c1ae6a3ad553e3d45a3fae5d1a' 
  AND token = 'nIb+pIxbE0FX0YLRUdum7AmAs7Go7ehTVzu2cmjOoMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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