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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0668b8f380885f4e4dd0c1cb63cdcf795495501f902bbfe0e1d9b42bc28c37e' 
  AND token = '2r58BHUBDNwrL3GAZ82RA8JpBwvJwSsslgbL611M1q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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