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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58de8c7e2ab3ed86879fb5b66bc377b554cc3af81b927a35b9bde3a8faadc6ef' 
  AND token = '94EQeoiDU7Ucr6FJnKqJ3nsVRWCszHN4/jtFP3/Ub+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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