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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c69cb6bc3e0ae1591cdb3e8a16ddaadad2391212431c26f4435f048f3fb217' 
  AND token = 'Hd4R7UF46rb629Ap2LZ2DDi44JsioRK95XGiAzQB2cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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