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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02319993a507a41953f400649aac2c4fb954649a0be6c9118512c980b249908e' 
  AND token = 'CCN+y3DqzpjJRgX0Yxr70dgOIxXPuZ9Cg3iCBg2yq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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