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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cc63cc2ff294185a7aa513e407c2b29340dacf45ffc431b75fcbe7a3354f5a' 
  AND token = 'nXQiITkGL9BVTlL73wTQtRS+GxoiMH+Uz+FcpAhyd78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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