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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ea700619334e18c46bcdecc8ad333836a17793faf3e724cc4fe498ae61bead' 
  AND token = '8cBFMQPTyDWtzuIaCtiudAtT0/5CePM0F4vRx/BmL7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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