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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cf24a866baae37dab4aa95ae23b9dd9c7c18492c72a832b9b823579135d4bf' 
  AND token = 'iS0gg6DNKAvilF2RxqikHpxNbLruyOHDWogn0kwR7/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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