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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eccc84f82b5cd7a739b6eaaa38668af1beffa7095e285723d46f0b5c35c1daa' 
  AND token = 'uNp0THQiB4RSoE1pEkMruxyMhGboTu/AYP4qn1chYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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