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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02efe7adac46a7343060237bc650106a66f323f0d85d5756f5df4ae865473d0d' 
  AND token = '2u7f+c5fHy4jMJn5K8lo/PDXCF9w91LylHJ5KK6tKUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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