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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef10bd2943b52a8915a30e640504d1d32c16ac7423d233b01bb0a2f8baae86bf' 
  AND token = 'TdOtaG19NILDctML/lMd/O4PBJ6Ys6JeEhoTbfIei7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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