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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba6538dbacf579cd321b2c74a888156a6b2b5f23c5c2c66cb654068917b4578' 
  AND token = '2DxkWof5NSFm2kmwMzYRSjWMCloXz28NvIcPT3Rfw1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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