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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce9c92bcffe554c336a64ccfe56e72aa709d2f29e2016a26ea1194c07d4ec4' 
  AND token = 'TB2r/ZFO7jEpeVRMq8Hkyka6s2nCvvoT5QecgCBoHmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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