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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb490b6704de8a87c6af51cd7b7c6d7b6ab582163e5f0da1cb501e905a1fc56' 
  AND token = '9x6/CGRT3klPK9e31kPqs4AVBhPJwjaqPg7rpEUlso4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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