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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458bf62e7c25f33dac996c5f26832d67ea32330aeb6d3c08ffea29f1484c3d88' 
  AND token = 'xx8pP3R603VQ+E0yopKxbc058ciNlPh/6FBbqZvbPzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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