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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8917947aea6e7b31edbc9bab0fec227497da9396441508af741420c40a2de57a' 
  AND token = 'mv/choyr7IrRsEP09p8G2im3HfRFlWY3EEDe3VHUtw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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