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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12d08dfd80c4a4f0fd98701640127aa11f1fe9ab5f75dffa7f07ae24736174f' 
  AND token = '8IqjmdW6e7IamRHtiI8dWkAGzdX0FBWDDse36gaiCN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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