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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7a44945100fdf144520c0bfbd3ce13cf593be5798534d9a34cb44361bb8ae0' 
  AND token = 'KVZWeicn9vgptxPmrcfc1v2c7sPAldHILPXgY6qDJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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