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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38ace768bd7009e5c8d211069dde6bf736d19d8069bf64148332d12e1156fbd' 
  AND token = 'Qp9Suip9OL8cTgI6lvFAB1CS8OSuugVn/ofc5qb+EPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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