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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3913cfb4d8ba093d63c8bf7dc64fc7e6103346a14234806f5ee0dc875957ddd2' 
  AND token = 'wrCVN820egrOp5GviBIwwaVgCn4C3gU3nH5ohoCE1+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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