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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca8e5dc24fa07029b49110e0426a621da063fc5a189eded360a922319ea7aa4' 
  AND token = 'AkmKRu5chbh51/b+y59aZqb0q63YdMYPhbStfP+cCko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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