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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f21312cc9a39637c5775869fe7fa03d8079c651124384c0a1712d0cc21b75d' 
  AND token = 'iiv+oIzKHJag56T3d+2LXmptOaWgFL8T3Eos7YY1oJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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