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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bb11ab7fe3569fb61ecbc1cd027e12c7e3a9fd4b8a37b14f1763d33c0133c3' 
  AND token = 's/DOkC+e8rK1laWMEVD30dT/Zl2kd2ED49Mr1bOu36Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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